Characterization of off-axis phase singular optical vortex and its nonlinear wave-mixing to generate control broad OAM spectra

We theoretically and numerically studied the off-axis Gaussian vortex beam (GVB) characteristics. The off-axis GVB scheme is utilized to generate tunable broad OAM modes using a single helical phase. The single helical phase can be easily created in the high peak power lasers using a spiral phase pl...

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Bibliographic Details
Published in:Physica scripta 2020-05, Vol.95 (5), p.55508
Main Author: Rao, A Srinivasa
Format: Article
Language:English
Subjects:
nonlinear wave-mixing
OAM spectra
off-axis Gaussian vortex beam
type-II SHG
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Summary:We theoretically and numerically studied the off-axis Gaussian vortex beam (GVB) characteristics. The off-axis GVB scheme is utilized to generate tunable broad OAM modes using a single helical phase. The single helical phase can be easily created in the high peak power lasers using a spiral phase plate (SPP). The high peak power GVBs greatly enhances the efficiency of nonlinear wave-mixing to tune the wavelength as well as OAM modes of laser beams. Further, we propose type-II second harmonic generation (SHG) of off-axis GVB to tune the wavelength and to increase the number of OAM modes of vortex beam. Polarization-controlled broad OAM spectra is generated at SHG wavelength. This scheme is effective for control generation of a broad range of OAM spectra in the required wavelength for high-capacity and multi-channel optical communication.
ISSN:0031-8949
1402-4896
DOI:10.1088/1402-4896/ab7b09